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Lifetime measurements with the recoil distance Doppler-shift technique have been performed to determine yrast  E 2 transition strengths in  178 Pt. The experimental data are related to those on neighboring Pt isotopes, especially recent data on  180 Pt, and compared to calculations within the interacting boson model and a Hartree-Fock Bogoliubov approach. These models predict prolate deformed ground states in Pt isotopes close to neutron midshell consistent with the experimental findings. Further, evidence was found that the prolate intruder structure observed in neutron-deficient Hg isotopes that is minimum in energy in  182 Hg becomes the ground state configuration in  178 Pt and neighboring  180 Pt with nearly identical transition quadrupole moments. The new data on  178 Pt are further discussed in the context of the systematics along the Pt isotopic chain with respect to a possible sharp shape transition towards a weakly deformed or a quasi-vibrational ground state whereas the prolate structure increases in energy in  174,176 Pt and becomes an intruder configuration similar to, for example,  180,182 Hg.

Structural investigation of neutron-deficient Pt isotopes: the case of 178Pt

Structural investigation of neutron-deficient Pt isotopes: the case of ¹⁷⁸Pt